Method and apparatus for detecting forward and reverse link imbalance in digital cellular communication systems
First Claim
1. An apparatus for detecting link imbalances in a digital cellular communication system comprising a plurality of wireless units and a plurality of base stations, wherein transmissions from the base stations to the wireless units are made using forward radio communication links and wherein transmissions from the wireless units to the base stations are made using reverse radio communication links, and wherein each forward link includes control and forward traffic channels, and each reverse link includes control and reverse traffic channels, the apparatus comprising:
- means for detecting a link failure in a first radio communication link between a wireless unit and a first base station during a call initiation, the means for detecting the link failure comprising means for determining whether the failure in the first radio communication link comprises a reverse link failure or a forward link failure;
means for determining whether the link failure is due to a link imbalance in the first radio communication link;
means for instructing the wireless unit to switch to a second radio communication link if the link imbalance exists;
means for determining if the reverse link failure is due to a weak reverse link, the means for determining if the reverse link failed due to a weak reverse link comprising means for determining whether a maximum number of access probes has been transmitted by the wireless unit to the first base station, wherein a value for the maximum number of access probes is transmitted in an access parameters message which is sent by the first base station to the wireless unit over a control channel associated with a forward link of the first base station;
means for initiating by the wireless unit communication on a secondary communication system if the maximum number of access probes has been transmitted by the wireless unit to the first base station; and
means for entering by the wireless unit an idle state and then re-initiate communication with a primary digital cellular communication system if the maximum number of access probes has not been transmitted by the wireless unit to the first base station.
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Abstract
An apparatus for detecting forward and reverse link imbalances in a digital cellular communication system is provided. An indication of maximum access probes is used to determine whether a link imbalance caused a reverse link failure to occur. The maximum access probes condition indicates that a wireless unit has attempted to access a base station a pre-defined maximum number of times. An indication of a lost paging channel and a traffic channel initialization (TCI) time out is used to determine whether a link imbalance caused a forward link failure to occur. If the wireless unit did not lose the paging channel, the apparatus determines whether a TCI time out occurred. If the wireless unit lost the paging channel, or it did not lose the paging channel but a TCI time out occurred, the apparatus determines the cause for the forward link failure.
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Citations
9 Claims
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1. An apparatus for detecting link imbalances in a digital cellular communication system comprising a plurality of wireless units and a plurality of base stations, wherein transmissions from the base stations to the wireless units are made using forward radio communication links and wherein transmissions from the wireless units to the base stations are made using reverse radio communication links, and wherein each forward link includes control and forward traffic channels, and each reverse link includes control and reverse traffic channels, the apparatus comprising:
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means for detecting a link failure in a first radio communication link between a wireless unit and a first base station during a call initiation, the means for detecting the link failure comprising means for determining whether the failure in the first radio communication link comprises a reverse link failure or a forward link failure;
means for determining whether the link failure is due to a link imbalance in the first radio communication link;
means for instructing the wireless unit to switch to a second radio communication link if the link imbalance exists;
means for determining if the reverse link failure is due to a weak reverse link, the means for determining if the reverse link failed due to a weak reverse link comprising means for determining whether a maximum number of access probes has been transmitted by the wireless unit to the first base station, wherein a value for the maximum number of access probes is transmitted in an access parameters message which is sent by the first base station to the wireless unit over a control channel associated with a forward link of the first base station;
means for initiating by the wireless unit communication on a secondary communication system if the maximum number of access probes has been transmitted by the wireless unit to the first base station; and
means for entering by the wireless unit an idle state and then re-initiate communication with a primary digital cellular communication system if the maximum number of access probes has not been transmitted by the wireless unit to the first base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification